Device and method for measuring vibration frequency of tall building structure on the basis of Doppler radar

A technology of Doppler radar and structural vibration, applied in measuring devices, measuring ultrasonic/sonic/infrasonic waves, instruments, etc., can solve problems such as non-contact measurement, easy wear and tear of mechanical equipment, frequency range limitation, etc., to achieve direction Good performance, good real-time, small measurement error

Inactive Publication Date: 2015-12-02
NANJING UNIV OF SCI & TECH
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Problems solved by technology

And this mechanical measurement method also has its inevitable defects, such as low sensitivity; non-contact measurement is not possible; the measured frequen

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  • Device and method for measuring vibration frequency of tall building structure on the basis of Doppler radar
  • Device and method for measuring vibration frequency of tall building structure on the basis of Doppler radar
  • Device and method for measuring vibration frequency of tall building structure on the basis of Doppler radar

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[0054] Example 1

[0055] In order to realize the technical scheme of the above-mentioned invention content, it is now described in conjunction with the software system simulation diagram.

[0056] Combine image 3 , Doppler radar system simulation is shown in the figure, the models and parameters of the key components used are as follows: (1) The frequency of the RF signal output by the AC power supply is 24.125GHz. (2) The power amplifier and drive amplifier are the same, the model is HMC863LP4E, the gain is 20dB, the insertion loss is 11dB, the return loss is 15dB, and the P1dB is 24.5dBm. (3) The model of the low noise amplifier is HMC517LC4, the gain is 20dB, the noise figure is 2.6dB, the insertion loss is 15dB, the return loss is 17dB, and the P1dB is 13dBm. (4) The model of the mixer is HMC292LC3B, the conversion loss is 8dB, the 1dB compression point is 13dBm, and the IIP3 is 18dBm.

[0057] The signal source in the Doppler radar sends out a signal of a certain frequency. ...

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Abstract

The invention discloses a device and method for measuring the vibration frequency of a tall building structure on the basis of a Doppler radar. The device comprises an AC power supply, a coupler, a driving amplifier, a power amplifier, an emitting antenna, a receiving antenna, a low-noise amplifier, and a mixer. The method comprises that the AC power supply generates a radiofrequency signal and the radiofrequency signal is divided into two sub radiofrequency signals by the coupler, wherein one sub radiofrequency signal is input into the mixer via the driving amplifier to provide a local oscillation signal and the other sub radiofrequency signal is input into the emitting antenna via the power amplifier to form an emitting signal; the emitting signal generates a reflected signal after reaching a vibrating target building structure and the reflected signal is received by the receiving antenna and is input into the mixer via the low-noise amplifier; the mixer mixes the received two signals and acquires a down-conversion signal in order to obtain Doppler frequency; and processing is carried out in order to finally obtain the vibration frequency of the target building structure. The method achieves noncontact measurement, has an all-weather operating characteristic, and is high in accuracy and good in realtimeness.

Description

technical field [0001] The invention belongs to the technical field of signal processing and detection, in particular to a device and method for measuring vibration frequency of high-rise building structures based on Doppler radar. technical background [0002] In today's society, a large number of high-rise and super high-rise buildings have appeared in cities. While buildings are getting taller, new lightweight and high-strength building materials are also emerging, which makes the stiffness and damping of high-rise structures continue to decline. High-rise buildings and super high-rise buildings are characterized by large slenderness ratios, which are prone to vibration and deformation under the action of dynamic loads (mainly wind loads). There are mainly the following aspects: ①The downwind vibration of the structure caused by the wind force consistent with the wind direction; ②The cross-wind vibration of the structure caused by the vortex behind the structure. ③ The ...

Claims

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Application Information

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IPC IPC(8): G01H9/00
Inventor 王楠李兆龙宋思琦童童陈如山
Owner NANJING UNIV OF SCI & TECH
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